Salesforce Sr Software Engineer interview questions

Basically my experience from the whole process is very positive. The first interview done by the software team leader who explained in detail what the team agenda is and background about salesforce. Then I explained what I am looking for and since there was a very good alignment I was invited for a f2f professional interview at salesforce offices. The professional interview included an intensive investigation about software design and implementations I did in the past - lots of deep and thorough questions. Then the TL presented a business problem his team is working on and I was requested to propose a software design for the problem - we discussed my design in detail and he asked leading questions to point me to things I was ignoring (was very good discussion , I enjoyed it). Then the TL presented an algorithmic problem and asked me to implement a code (on a paper) - the problem was not easy but fair - I code the naive exponential solution and the team leader asked leading questions helping me to reach the more efficient solution (again in a very positive manner - was very comfortable constructive discussion). At the end of the interview I was invited to an additional professional interview with different interviewers (to have a second opinion on me) - the second interview was conducted in the same manner and spirit but different questions. Again the second interview was done in a very positive constructive manner. Then I was invited to additional interview with 2 higher managers - was very good conversation less technical just on my personality and aspirations and they provided more info about the company and the role they intend for me. The whole process was very professional and positive - better than experience I have with other companies. Because of the high level of interviews and interviewers I decide to accept the offering and join this company.